11.5 Lysogeny is maintained by an autogenous circuit 瓯气q PRMPR/OR nutR PRE Cis-actin elements c/f N cro Genes Positive Ant iterm inator Repressor Antirepressor Positive Functions reculator regulator mm unity region Figure 11 12 The lambda regulatory region contains a cluster of trans-acting functions and cis-acting elements 消当Figure 11.12 The lambda regulatory region contains a cluster of trans-acting functions and cis-acting elements. 11.5 Lysogeny is maintained by an autogenous circuit